8tlq
Cryo-EM structure of the Rev1-Polzeta-DNA-dCTP complex
Structural highlights
FunctionDPOD2_YEAST DNA polymerase delta (DNA polymerase III) participates in chromosomal DNA replication. It is required during synthesis of the leading and lagging DNA strands at the replication fork and binds at/or near replication origins and moves along DNA with the replication fork. It has 3'-5' proofreading exonuclease activity that correct errors arising during DNA replication. It is also involved in DNA synthesis during DNA repair.[1] Publication Abstract from PubMedRev1-Polzeta-dependent translesion synthesis (TLS) of DNA is crucial for maintaining genome integrity. To elucidate the mechanism by which the two polymerases cooperate in TLS, we determined the cryogenic electron microscopic structure of the Saccharomyces cerevisiae Rev1-Polzeta holocomplex in the act of DNA synthesis (3.53 A). We discovered that a composite N-helix-BRCT module in Rev1 is the keystone of Rev1-Polzeta cooperativity, interacting directly with the DNA template-primer and with the Rev3 catalytic subunit of Polzeta. The module is positioned akin to the polymerase-associated domain in Y-family TLS polymerases and is set ideally to interact with PCNA. We delineate the full extent of interactions that the carboxy-terminal domain of Rev1 makes with Polzeta and identify potential new druggable sites to suppress chemoresistance from first-line chemotherapeutics. Collectively, our results provide fundamental new insights into the mechanism of cooperativity between Rev1 and Polzeta in TLS. Cryo-EM structure of the Rev1-Polzeta holocomplex reveals the mechanism of their cooperativity in translesion DNA synthesis.,Malik R, Johnson RE, Ubarretxena-Belandia I, Prakash L, Prakash S, Aggarwal AK Nat Struct Mol Biol. 2024 Sep;31(9):1394-1403. doi: 10.1038/s41594-024-01302-w. , Epub 2024 May 8. PMID:38720088[2] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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